Unlock iOS 4.3.1 iPhone 4, 3GS [Ultrasn0w]

iPhone Dev Team has released a new version of Ultrasn0w to fix issues with signal on iPhone 4, 3GS on the old baseband.

Note: Ultrasn0w 1.2.1 unlocks the older baseband  on iOS 4.3.1 custom firmware. This will not work for newer baseband, and is essentially a fix for signal bar. It only fixes the compatibility and signal bar issues on the existing devices, which are jailbroken (with preserved basebands: 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00) on iOS 4.3.1 using PwnageTool or Sn0wbreeze.

How to Unlock iOS 4.3.1 iPhone 4, iPhone 3GS

1. MAke sure your iPhone is jailbroken with Sn0wbreeze or Pwnagetool.

2. Run Cydia > manage > sources > Edit > Add > http://repo666.ultrasn0w.com and hit the Add Source button.

3. Now search for Ultrasn0w and install it. Restart when done.

If you are on a newer bootloader or baseband, there’s no software unlock available, so you can stop looking for one and may be you can try a Hardware based, Jailbreak-free Unlock for iPhone 4.

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